Objective-C Language Error Handling Error & Exception handling with try catch block
Example
Exceptions represent programmer-level bugs like trying to access an array element that doesn’t exist.
Errors are user-level issues like trying load a file that doesn’t exist. Because errors are expected during the normal execution of a program.
Example:
NSArray *inventory = @[@"Sam",
@"John",
@"Sanju"];
int selectedIndex = 3;
@try {
NSString * name = inventory[selectedIndex];
NSLog(@"The selected Name is: %@", name);
} @catch(NSException *theException) {
NSLog(@"An exception occurred: %@", theException.name);
NSLog(@"Here are some details: %@", theException.reason);
} @finally {
NSLog(@"Executing finally block");
}
OUTPUT:
An exception occurred: NSRangeException
Here are some details: *** -[__NSArrayI objectAtIndex:]: index 3 beyond bounds [0 .. 2]
Executing finally block
